There is a new twist to this: The effect can be remedied by using a
shorter USB extension cable. So it is obvious that the crashes result
from bad communication or bad reaction of the device due to insufficent
power.

Question is: Is a misbehaveing USB device like something like bad
hardware, that may trigger crashes, or do we see USB devices as
unreliable devices we need to handle.

The crash happend once while unplugging the WLAN stick while data was
transfered. This is a clue that the same state may be provoked by
unplugging of the device in an inconvenient moment, which is of course
totally legal and should NOT crash the system.

Should we go on here or should I file a new bug with a new description
of the crashs's cause?

** Changed in: linux (Ubuntu)
       Status: Expired => Incomplete

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https://bugs.launchpad.net/bugs/1419341

Title:
  Kernel crashes in rt2x00queue_get_entry+0x24

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